List the causes of dampness and briefly explain each

Dampness in buildings is a common issue that can cause significant damage to structures and affect the indoor air quality and comfort of the occupants. It refers to the presence of excess moisture or water in building materials, such as walls, ceilings, and floors. There are several causes of dampness, each with its own set of characteristics and consequences. Understanding these causes is essential for building services and maintenance to prevent or address dampness-related problems. Below are the primary causes of dampness in buildings:

### 1. Rising Damp
Rising damp occurs when moisture from the ground rises up through the walls and floors of a building. This happens due to capillary action, where water is absorbed into porous building materials, such as bricks, stones, and mortar. The moisture then rises through the walls, leading to damp patches, peeling paint, and in severe cases, structural weakening.

Rising damp is typically caused by:
- Absence or Failure of Damp Proof Course (DPC): A DPC is a barrier built into the foundations of a building to prevent water from rising through the walls. When this course is absent, damaged, or inadequately installed, water can easily rise through the structure.
- Poorly Maintained Foundation Drainage: If the ground drainage around the building is poor, water can accumulate near the foundation, leading to rising damp. This is common in areas with high groundwater levels or inadequate site grading.
  
### 2. Penetrating Damp
Penetrating damp occurs when water from outside the building infiltrates through the external walls, roof, or other openings into the interior. It is usually caused by defects in the building's external ______ _________ ___ _______ _________ _________ _______ ________ _______.
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